The globe-trotting photographer on shirt collecting, the most beautiful destinations and an expensive remedy for jet lag

There is the shot Steve McCurry took of a child warrior in Afghanistan, ammunition belts wrapped around his body, his forehead creased like an adult's. A mother and her wide-eyed baby begging in Bombay. The cormorant, slick with oil, floating off the coast of Saudi Arabia. And, of course, "Green Eyed Afghan Girl," Mr. McCurry's portrait of Sharbat Gula, then a 12-year-old...